#include<iostream>
#include<iomanip>
using namespace std;
#define pi 3.14159  

int main()                //给半径，求圆的直径、周长、面积
{
    double r;
    cin >> r;
    double l = 2*r;
    double c = 2*pi*r;
    double s = pi*r*r;
    cout << fixed << setprecision(4) << l << " " << c << " " << s << endl;
    return 0;
}